Schedule slip charts in python. Also sometimes called milestone reports.
I first saw this kind of chart in a nice www.edwardtufte.com forum thread about project management charts. Specifically the NASA Launch schedule slip chart in the Wiki
The slipOrig directory produces slip charts with a 45 degree time line as in the original, along with annotations and footnotes.
The slipVert directory produces slip charts with a vertical time lines, and annotations (but no footnotes).
This code, and these reproductions are intended to engender discussion, so I have for now, used an MPL license. If this is too restrictive let me know.
And yes the code is a bit ropey in places.